OEM Carrier Transformer 40VA 120V/24V for Model GB3AAV060135AGJA

This OEM step-down transformer (part number HT01BC116) is the factory-specified replacement for the Carrier GB3AAV060135AGJA gas furnace. The transformer converts 120V line voltage to 24V AC to power the furnace's low-voltage control circuit — including the thermostat, control board, gas valve, and safety switches. When the transformer fails, the entire control circuit goes dead: the thermostat shows no response, the furnace won't call for heat, and no status codes appear on the control board. A failed transformer is often caused by a shorted component downstream, so always check for wiring faults before installing the replacement.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Direct plug-in or screw-terminal mount matching factory configuration
• OEM vs Generic: This is the factory OEM transformer, wound to exact VA rating and insulation class. Undersized generic transformers can overheat, trip the internal breaker repeatedly, or fail prematurely when control circuit demand peaks during ignition sequencing.
• Install difficulty: 2/5 — Turn off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all low-voltage wiring before disconnecting terminals.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier GB3AAV060135AGJA gas furnace. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. If your system has a history of transformer failures, inspect the low-voltage wiring harness for shorts before installation. Have questions about fitment? Our HVAC parts specialists verify compatibility before every order — call or chat today.